Input validation error in Apache HTTP Server

1) Input validation error

EUVDB-ID: #VU32549

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-6438

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The dav_xml_get_cdata function in main/util.c in the mod_dav module in the Apache HTTP Server before 2.4.8 does not properly remove whitespace characters from CDATA sections, which allows remote attackers to cause a denial of service (daemon crash) via a crafted DAV WRITE request.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Apache HTTP Server: 2.4.0 - 2.4.7

External links

http://advisories.mageia.org/MGASA-2014-0135.html
http://archives.neohapsis.com/archives/bugtraq/2014-10/0101.html
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10698
http://lists.apple.com/archives/security-announce/2015/Apr/msg00001.html
http://marc.info/?l=bugtraq&m=141017844705317&w=2
http://marc.info/?l=bugtraq&m=141390017113542&w=2
http://seclists.org/fulldisclosure/2014/Dec/23
http://secunia.com/advisories/58230
http://secunia.com/advisories/59315
http://secunia.com/advisories/59345
http://secunia.com/advisories/60536
http://security.gentoo.org/glsa/glsa-201408-12.xml
http://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x/CHANGES
http://svn.apache.org/viewvc/httpd/httpd/trunk/modules/dav/main/util.c
http://svn.apache.org/viewvc/httpd/httpd/trunk/modules/dav/main/util.c?r1=1528718&r2=1556428&diff_format=h
http://www.apache.org/dist/httpd/CHANGES_2.4.9
http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
http://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
http://www.securityfocus.com/archive/1/534161/100/0/threaded
http://www.securityfocus.com/bid/66303
http://www.ubuntu.com/usn/USN-2152-1
http://www.vmware.com/security/advisories/VMSA-2014-0012.html
http://www-01.ibm.com/support/docview.wss?uid=swg21669554
http://www-01.ibm.com/support/docview.wss?uid=swg21676091
http://www-01.ibm.com/support/docview.wss?uid=swg21676092
http://blogs.oracle.com/sunsecurity/entry/multiple_input_validation_vulnerabilities_in1
http://httpd.apache.org/security/vulnerabilities_24.html
http://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b@%3Ccvs.httpd.apache.org%3E
http://puppet.com/security/cve/cve-2013-6438
http://support.apple.com/HT204659
http://support.apple.com/kb/HT6535

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.